题目内容
计算:
(1)(
)-2+33+20110;
(2)(
-
+
)•x3;
(3)
-
.
(1)(
| 1 |
| 2 |
(2)(
| 1 |
| x3 |
| 1 |
| x2 |
| 1 |
| x |
(3)
| (x+y)2 |
| xy |
| (x-y)2 |
| xy |
(1)(
)-2+33+20110
=4+27+1
=32;
(2)(
-
+
)•x3
=1-x+x2;
(3)
-
=
=
=4.
| 1 |
| 2 |
=4+27+1
=32;
(2)(
| 1 |
| x3 |
| 1 |
| x2 |
| 1 |
| x |
=1-x+x2;
(3)
| (x+y)2 |
| xy |
| (x-y)2 |
| xy |
=
| (x+y)2-(x-y)2 |
| xy |
=
| 4xy |
| xy |
=4.
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